Speed-recorder.



'PATENTED JUNE 16, 1908;

E, WALDER.

SPEED RECORDER.

APPLIOATION FILED JUNE 22,1906.

UNITED STATES PATENT OFFIGE.

HAN-i WALDER, OF MEILEN, SWITZERLAND.

SPEED-RECORDER.

Application filed June 22, 1906.

To all whom it may concern:

Be it known that I, HANS WALDER, residing at Meilen, Switzerland, haveinvented certain new and useful Im rovements in Speeddtecorders; and Ido iereby declare the following to bea full, clear, and exact description of the invention, such as will enable others skilled in the art towhich it appertains to make and use the same.

The present invention relates to a speedrccorder or speed-gage which isbased on the well known principle that moved permanent magnets influencegood conductors in conscq uence of the Foucault currents generated inthem if the latter are brought into the magnetic field, and thisinvention has for its ob ject a special device in which several 1nagnetsare jointed to a wheel, said wheel. being rotated by the shaft the speedof which is to be measured, while the conductor to be in financed by themagnets consists of a fiat plate which is movable tangentially to thecirc u inference of said wheel.

The speed-recorder is illustrated in the accompanying drawin in which:

Figure 1 is a vertical section through the axis; Fi 2 is a plan with thecover partly remove Fig. 3 is an end elevation, the end of the casehaving been removed, and Fig. 4 shows another way oi making the magnet-Wheel.

The axle 3 is mounted in a case 2 closed on all sides, said case beinprovided with an inspectionopening only on the top, which og'iening isclosed by a g ass plate. A wheellnre body tis carried on the end oi saidaxle 3 projecting inside the case, which body 4 consists of a nu inbcrof magnets 5, with their poles turned towards the periphery. A flatplate 6 consisting of good conducting material is mounted close to thecylindrical outer circumference of those magnets, said plate beingthereby under the influence of the magnets, and is moved in thedirection of the arrow II by the rotation of the magnetwheel 4 in thedirection of the arrow 1. For the purpose oi" guiding the some the plate6 is provided with two arms 7, 7 ointing downwards and formed fork-likewhich ongage wheels 8 running on a rail 9. At its upper edge the guidingis effected by a roller 10 connected with the plate and a rod 11 fixedto the frame of the speed-recorder, so that the late can move easily butwith certainty rectilineally, e. in the direction of the tan-Specification of Letters Patent.

site the place at which the Patented June is, 1908.

Serial No. 322,842..

gent to the direction of rotation of wheel 4, between the rod 11 and therail 9.

The displacement occasioned by the action of tne magnets 5 is opposed bya s ring. Said spring may either consist in an or inary s iral spring 23which engages any part 0 the carriage on the one hand and the case onthe other hand, or the spring may be formed in any other approvedmanner.

A piece of lI'OIl 12 can be arranged oppolate 6 nearly touches thecircumference o the magnet wheel for increasing the effect. Further anarm 13 is joined to the plate 6 which arm runs out into a pointer whichmoves over a plate 14 provided with a scale under the in s ectionopening 1 and thereby makes known tlie displacement of the plate orcarriage.

Now in order to give a permanent record of the velocit measured by thedevice or an in dication o the velocity of rotation which a shaft he'sin the course of a iven. period, a rccording-device is arrangedconsisting of a roller 15 covered with paper, the axle oi which liesparallel to the direction or motion of the carriage or late 6, and astyle 17 joined with the carriage by a sprin 16, said style contactingthe surface of the rdllcr when the carriage moves. The roller 15 isrotated at a uniformly slow speed by clockwork G of any ap rovedconstruction arranged between the' mine-plates 18.

For continuous recording, i, e. for record-- iug during long periods forwhich the periphery of the roller 15 would not suliice, a longer stripof paper is continuously led over the roller, said strip being wound ona roller 19 at the commencement of the recording, and then led over therecording roller 15 and wound up on the roller '20 resting in verticallyguir ed bearings 21, said bearings being carried by springs 22 andpressed upwards, so that the periphery of t re roller 20 con:

tinually contacts with the peri )hery of the recording roller 15 and canyiel or give way with the increase of its diameter on account of itswinding upthe strip of paper. This or ran ement renders it possible todrive the recor ing roller only, whereby the driving mechanism issimplified exceedingly. Therefore when at work the ap aratus effects apermanent record of the ve ocities by drawmg a curve, besides he visibleindication through the glass of I speed attained, the abscissee beingthe tin 1101 the ordinates the velocity, which make possible to knowexactly the durationand the point of t me of the diflerent velocities. v

Instead ofthe arrangement of the magnets and the form of the movableconductor as shown in Fig. 1, such an arrangement as.

. either beside one another nor one over the other. Then the conductorhas a longitudinal rib which enters between the poles, said poles beingarranged so that an annular groove is left free between the same. Withthis arrangement it is possible to form the magnets ashorseshoe-magnets. By this arrang'ement a stronger action of themagnetson the conductor is made possible.

l/Vhat I claim is: I

1-. In a'speed lneasurer, the combination,

with a revoluble wheel having ma nets at its periphery, of twostationary gui e rails arranged one above the other, a metallic latearran ed at a tan ent to the said whee and provi ed with r01 ers whichrun on the said guides, a spring for movin the said plate in onedirection, and means i 01 measuring the displacement of the said platewhen the said wheel is revolved.

2. In a s eed measurer, the combination, with a revo uble wheel havingmagnets at its periphery, of a slidable metallic plate arranged at atangent to the said wheel, guides for the said plate, a record rollerrovided with means for-revolving it, a supp y roller, a receivingroller, aspring for pressing the said receiving roller against the saidrecord roller, a record strip wound onthe said su 4 ply and receivingrollers and passing over t e said record roller, and a marker carried bythe said plate and bearing on the said strip.

In testimony whereofl afiix my signature,

in-presence of two witnesses.

HANS WALDER.

l/Vitnesses:

A. LIEBERKNECHT, Enw. KLEINER.

